i8a Count Rumford’s Enquiry concerning the Nature of Heat, See. 
of heat that are generated at its surface, by the continual action 
of the solar rays ? 
If this conjecture should be well founded, we should be led 
to conclude, that the inhabitants of certain hot countries, who 
sleep at night on the tops of their houses, in order to be more 
cool and comfortable, do wisely, in choosing that situation to 
pass their hours of rest. 
